thread sleep

 1 using namespace std;
 2 void ppp()
 3 {
 4     for (int i=0;i<50;i++)
 5     {
 6         cout << "hello " << endl;
 7     }
 8     
 9 }
10 void ppp1()
11 {
12     for (int i = 0; i < 50; i++)
13     {
14         cout << "hello1 " << endl;
15     }
16 
17 }
18 
19 int main()
20 {
21     
22 
23     //thread(ppp).join();
24     //thread(ppp1).join();
25 
26     thread a(ppp);
27     thread b(ppp1);
28     a.join();
29     b.join();

30 
31     cout << "hello1 " << endl;
32 
33 
34 
35 
36     return 0;
37 }